..These results suggest that colonization of a marginal new environment could be facilitated by enhanced rates of cannibalism. The possible interplay between cannibalism and physiological adaptation to a new environment is discussed...

Reproductive isolation between divergent races of pea aphids on two hosts. II. Selection against migrants and hybrids in the parental environments

S ViaDepartment of Biology, University of Maryland, College Park 20742, USAEvolution 54:1626-37. 2000

..Although this variation suggests that a generalized pea aphid could evolve, such generalists are not seen in field collections of these populations...

..After presenting the basics of the evolutionary process, I discuss the factors that determine the outcome of evolution, the role of key innovations and extinction in evolution, and whether the evolution of human life is inevitable...

Quantitative genetics of feeding behavior in two ecological races of the pea aphid, Acyrthosiphon pisum